Question : Problem: speaker for Mac G4 Cube

I have Mac G4 Cube that have no mini jack to connect speaker, I go to store to buy  speaker but they told me that I need speaker with USB jack, where I will find and how does it like, thanks.

Answer : Problem: speaker for Mac G4 Cube

Sounds like you need an iMic!
http://www.griffintechnology.com/products/imic/

A great product. It also allows one to record/digitize any audio source.